Multilayer coextruded film for controlling grease migration

Abstract

A multilayer coextruded film which includes at least one oil and grease absorbing layer and at least one oil barrier layer. The at least one oil and grease absorbing layer includes at least one styrenic block copolymer. Each oil barrier layer includes one or more polyolefins. Some multilayer coextruded films include an interior sealing layer. Further multilayer coextruded films include an exterior finishing layer with the oil barrier layer and the oil and grease absorbing layer disposed between the interior sealing layer and the exterior finishing layer.

1 - 15 . (canceled) 
     
     
         16 . A multilayer coextruded film comprising:
 at least one oil and grease absorbing layer, wherein the at least one oil and grease absorbing layer comprises at least one styrenic block copolymer; and   at least one oil barrier layer, wherein each oil barrier layer comprises one or more polyolefins.   
     
     
         17 . The multilayer coextruded film of  claim 16  further comprising an interior sealing layer. 
     
     
         18 . The multilayer coextruded film of  claim 17  further comprising an exterior finishing layer, where the at least one oil barrier layer and the at least one oil and grease absorbing layer are disposed between the interior sealing layer and the exterior finishing layer. 
     
     
         19 . The multilayer coextruded film of  claim 17  where at least one of the oil and grease absorbing layers is disposed between the interior sealing layer and the at least one oil barrier layer. 
     
     
         20 . The multilayer coextruded film of  claim 17  where at least one of the oil barrier layers is disposed between the interior sealing layer and the at least one oil and grease absorbing layer. 
     
     
         21 . The multilayer coextruded film of  claim 16  where at least one oil and grease absorbing layer includes an interior sealing layer at an interior surface. 
     
     
         22 . The multilayer coextruded film of  claim 16  where the at least one oil and grease absorbing layer comprises a blend of styrenic block copolymers and polyolefins. 
     
     
         23 . The multilayer coextruded film of  claim 16  where the at least one oil and grease absorbing layer comprises a blend of styrenic block copolymers and polyolefins selected from polyethylene or polypropylene. 
     
     
         24 . The multilayer coextruded film of  claim 16  where the at least one oil and grease absorbing layer comprises a blend of styrenic block copolymers and polyethylene. 
     
     
         25 . The multilayer coextruded film of  claim 16  where the at least one oil and grease absorbing layer further comprises maleic-anhydride grafted polyolefin. 
     
     
         26 . The multilayer coextruded film of  claim 26  where the styrenic block copolymer is selected from styrene-butadiene-styrene, styrene-isoprene-styrene, styrene-ethylene/butylene-styrene, or combinations thereof, or particularly styrene-butadiene-styrene. 
     
     
         27 . The multilayer coextruded film of  claim 16  where the at least one oil and grease absorbing layer comprises 5 to 99% by weight styrenic block copolymer, or particularly 20 to 70% by weight styrenic block copolymer. 
     
     
         28 . The multilayer coextruded film of  claim 16  wherein the at least one oil and grease absorbing layer comprises 20 to 50% by weight styrene-butadiene-styrene, 35 to 65% by weight polyethylene, and 5 to 25% by weight maleic-anhydride grafted polyolefin. 
     
     
         29 . The multilayer coextruded film of  claim 16  where the at least one oil barrier layer comprises 20 to 99% polyethylene, the polyethylene selected from high density polyethylene, medium density polyethylene, linear low-density polyethylene, ultra-low density polyethylene, or combinations thereof. 
     
     
         30 . The multilayer coextruded film of  claim 17  where the interior sealing layer comprises a polyolefin material. 
     
     
         31 . The multilayer coextruded film of  claim 18  where the exterior finishing layer comprises a polyolefin material. 
     
     
         32 . The multilayer coextruded film of  claim 18  where the interior sealing layer comprises a polyolefin material. 
     
     
         33 . The multilayer coextruded film of  claim 22  where the at least one oil and grease absorbing layer further comprises maleic-anhydride grafted polyolefin.